Mycoherbicides for grass weeds of cereals can be improved by the addition of fungal germination stimulants

Lindhout, K, Aitken, EAB, Dale, M, and Hetherington, S (2002) Mycoherbicides for grass weeds of cereals can be improved by the addition of fungal germination stimulants. In: 13th Biennial Australasian Plant Pathology Conference Handbook. p. 348. From: 13th Biennial Australasian Plant Pathology Society Conference, 24-27 September 2001, Cairns, QLD, Australia.

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Wild oat, Avena fatua L. is a troublesome weed of Australian cereal crops which is developing resistance to many herbicides. Mycoherbicides are a promising alternative to chemical herbicides and their advantages lie in the reduction of chemical usage; reduction in risks to health and the environment; an increase in the value of export commodities and a decrease in production costs. Mycoherbicides are plant pathogenic fungi that are applied in an inundative strategy to control weeds in the same way chemical herbicides are applied. Arguably, the greatest constraint in the development of a mycoherbicide is the environmental conditions that are required to produce an aggressive and extensive infection on the host plant. Superficial water is the most limiting resource, especially in dryland cropping systems and fungal inoculum may require a dew period of more than twelve hours for severe infection to occur (1).

The addition of germination stimulants to mycoherbicidal formulations may reduce the dew period requirement. Iron chelators have been shown to reduce infection periods by several hours and increase the aggressiveness of pathogens (2) by leaching iron from the conidium, thus stimulating germination.

This study aims to determine if iron chelators, namely Citric Acid, 2,3-dihydroxybenzoic acid (DHBA) and 8-hydroxy-7-iodo-5-quinoline sulfonic acid (IQSA) are capable of reducing the dew period requirement of Drechslera avenacea (Curtis and Cooke) Shoem (telomorph: Pyrenophora chaetomioides).

Item ID: 54109
Item Type: Conference Item (Presentation)
Funders: Grains Research and Development Corporation
Date Deposited: 13 Aug 2018 23:12
FoR Codes: 06 BIOLOGICAL SCIENCES > 0607 Plant Biology > 060704 Plant Pathology @ 80%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0703 Crop and Pasture Production > 070308 Crop and Pasture Protection (Pests, Diseases and Weeds) @ 20%
SEO Codes: 82 PLANT PRODUCTION AND PLANT PRIMARY PRODUCTS > 8204 Summer Grains and Oilseeds > 820499 Summer Grains and Oilseeds not elsewhere classified @ 100%
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